Published online April 3, 2006
PEDIATRICS Vol. 117 No. 4 April 2006, pp. 1169-1173 (doi:10.1542/peds.2005-0744)
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Transcutaneous Bilirubin Levels in the First 96 Hours in a Normal Newborn Population of ≥35 Weeks' Gestation

M. Jeffrey Maisels, MB, BCh and Elizabeth Kring, RN

Department of Pediatrics, William Beaumont Hospital, Royal Oak, Michigan

OBJECTIVE. To obtain transcutaneous bilirubin (TcB) measurements, at 6-hour intervals, in the first 96 hours after birth in a normal newborn population (gestational age: ≥35 weeks).

METHODS. We performed 9397 TcB measurements on 3984 healthy newborn infants (gestational age: ≥35 weeks) from 6 to 96 hours of age. All measurements were performed in the well-infant nursery with a Draeger Air-Shields transcutaneous jaundice meter (model JM-103), within 2 hours of the designated time.

RESULTS. There was a distinct pattern to the velocity of the increase in TcB levels over different time periods. TcB levels increased in a linear manner most rapidly in the first 6 to 18 hours and then less rapidly from 18 to 42 hours, followed by a much slower increase until peak levels occurred. Decreasing gestational age was associated significantly with higher TcB levels.

CONCLUSIONS. We provide data on neonatal bilirubinemia, based on TcB levels determined in a large, predominately white and breastfed, North American population. Infants who require closer evaluation and observation initially are those whose bilirubin levels are ≥95th percentile, ie, increasing more rapidly than 0.22 mg/dL per hour in the first 24 hours, 0.15 mg/dL per hour between 24 and 48 hours, and 0.06 mg/dL per hour after 48 hours. These data should be useful for detecting aberrant trends, identifying infants who need additional evaluation, and planning appropriate follow-up for jaundiced newborns.

Key Words: bilirubin • newborn • jaundice • transcutaneous bilirubin

Abbreviations: TcB—transcutaneous bilirubin • TSB—total serum bilirubin

Accepted Sep 23, 2005.


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